特低渗油藏水驱波及半径计算方法研究  

Experimental study on calculating method of water flooding radius in ultra-low permeability

作　　者：石立华 SHI Lihua(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710065,China;Shaanxi Research Center for Exploration and Development Engineering Technology of Extra Low Permeability Oil and Gas,Xi’an 710075,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,西安710065 [2]陕西省特低渗透油气勘探开发工程技术研究中心,西安710065

出　　处：《非常规油气》2024年第2期66-73,共8页Unconventional Oil & Gas

基　　金：陕西省自然科学基础研究计划项目(面上)“致密砂岩储层微观孔喉结构及薄膜流动对渗吸规律的影响”(2023-JC-YB-423);陕西省自然科学基础研究计划项目(面上)“页岩油储层微-纳米孔喉系统量化表征及对可动流体赋存状态控制机理研究”(2022JQ-290)。

摘　　要：由于特低渗油藏渗透率低,非均质性强,裂缝发育,注水过程中注水波及参数难以预测,无法及时为注水调整提供指导。为了更好地表征注入水在地层中的波及距离和程度,开展了特低渗油藏水驱波及半径计算方法研究。该方法基于注采动态数据,对油藏注采系统进行简化表征,将注水井与采油井间油藏离散成一系列由基质和裂缝参数组成的质量单元体,以质量单元体为目标建立油水井间物质平衡方程,追踪水驱前缘饱和度,通过非均质性注水劈分计算,得到某一时刻注入水流量,进而求得该时刻注入水的波及半径。研究结果表明,该计算方法简单方便,可定量表征水驱波及前缘动态突进,追踪水驱波及方向,实时反映油井见水见效程度。计算结果与水驱前缘动态监测结果吻合性好,验证了该方法的有效性,对特低渗油藏注水开发调控具有一定的指导意义。Due to low permeability,strong heterogeneity,and developed fractures in ultra-low permeability reservoirs,it is difficult to predict water injection sweep parameters during water injection,which cannot guide water injection adjustment in time.Therefore,the calculation method of the swept radius of water flooding in ultra-low permeability reservoirs was studied to characterize better the swept distance and degree of injected water in the formation.Based on the dynamic data of injection and production,the injection and production system of the reservoir was simplified and characterized with the method to discretize the reservoir between water injection wells and production wells into a series of mass units composed of matrix and fracture parameters.The material balance equation between oil and water wells with the mass unit as the target was established to track the saturation of the water flooding front.The injected water volume was obtained at a certain time through heterogeneous water injection splitting calculation.So,the swept radius of the injected water at that time was obtained.The research results show that the calculation method is simple and convenient,which can quantitatively characterize the water flooding swept front and behavior,track the swept direction of water flooding,and reflect the water breakthrough and effectiveness in oil wells in real time.The calculation results agree with the dynamic monitoring results of the water flooding front.This verifies the method’s effectiveness and has a certain guiding significance for water injection development regulation of ultra-low permeability reservoirs.

关 键 词：油藏工程 物质平衡 水驱波及半径 水驱前缘 应用 

分 类 号：TE348[石油与天然气工程—油气田开发工程]